Turing test is a test proposed (1950) by the English mathematician Alan M. Turing to determine whether a computer can be said to "think."
There are extreme difficulties in devising any objective criterion for distinguishing "original" thought from sufficiently sophisticated "parroting"; indeed, any evidence for original thought can be denied on the grounds that it ultimately was programmed into the computer. Turing sought to cut through the long philosophical debate about exactly how to define thinking by means of a very practical, albeit subjective, test: if a computer acts, reacts, and interacts like a sentient being, then call it sentient. To eliminate anthropocentric bias, Turing suggested the "imitation game," now known as the Turing test: a remote human interrogator, within a fixed time frame, must distinguish between a computer and a human subject based on their replies to various questions posed by the interrogator. By means of a series of such tests, a computer's measure of success at "thinking" can then be quantified by its probability of being misidentified as the human subject.
Turing predicted that by the year 2000 a computer "would be able to play the imitation game so well that an average interrogator will not have more than a 70-percent chance of making the right identification (machine or human) after five minutes of questioning."
Excerpt from the Encyclopedia Britannica without permission.